[BUG] Logs says error, but there are no errors

[gabrik]

Some logs reports errors even if they are just debug information.

Example:

[2019-06-06 14:57:31,971] - [ERROR] > < store_file() > Called for: /var/fos/linuxbridge/start_6cc2aa30.sh
[2019-06-06 14:57:31,972] - [ERROR] > < store_file() > Stored: 948 bytes


[2019-06-06 14:59:13,034] - [ERROR] > < file_exists() > Called for: /var/fos/lxd/images/test.tar.gz
[2019-06-06 14:59:13,034] - [ERROR] > < file_exists() > Result True
[2019-06-06 14:59:13,036] - [ERROR] > < checksum() > Calculating SHA256 of /var/fos/lxd/images/test.tar.gz

Change the log to use logger.debug

[gabrik]

Solved by #99